When my DH was in the nursing home for 3 years, his stuff disappeared often. He was casual about it (except for his chocolates) and knew who did it, and often simply rolled his chair there and got his own stuff. There was one older lady who had a habit of going into empty rooms and rummaging through drawers while the owners were watching TV, etc. Every so often the staff would search her chest of drawers and remove all that had other room numbers on them.